A mobile phone is like a small radio receiver and transmitter. The so-called impact on human health is mainly concentrated on the emission of radio waves. These waves contain electromagnetic radio frequency spectrum, just like microwave ovens and airport radars, but microwave ovens have no effect on the human brain, and the intensity of radar signals touching the human body is small. The energy emitted by a mobile phone does not exceed 6/10 of a watt, but it is directly to the user's head. Microwaves heat objects, which is why microwave ovens can cook.
But the heat generated by the phone is negligible. John Molde, a professor of radiation oncology at the University of Wisconsin Medical School in Milwaukee, USA, said: "If the cell phone has any biological effects, it is not caused by heat, but because of the electromagnetic waves generated by radiation. Just like X-ray. And the ultraviolet radiation from the sun may cause cancer risk, because it can destroy the body's DNA, the so-called DNA." Researchers believe that if the phone really has this effect, it must be discovered, but now This is not the case. Professor Molde said: "The current extensive publicity of research in this area is limited to the use of mobile phones. More often than not, the main findings of this research are cited."
In fact, a large number of surveys show that there is no necessary connection between mobile phones and brain cancer. Recently, researchers from the Massachusetts Institute of Epidemiology have compared the causes of disability of the two groups with the support of mobile phone manufacturers. One group consists of drivers who regularly use mobile phones, and the other group is the same number of drivers who use a car phone with a ceiling antenna, which means that the latter is not exposed to microwave radiation. After investigation and verification, the final results showed that there was no difference in cancer disability among the two groups. Another study came from the American Health Foundation. The researchers there compared more than 450 inpatients with brain cancer to the same number of hospitalized patients with other diseases, and found that there is no correlation between the use of mobile phones and brain cancer, although there is a small percentage of brain cancer. The patient is a mobile phone user.
Despite this, the National Cancer Institute is still conducting further research on the use of mobile phones to harm humans and cause cancer. In August of this year, the US Food and Drug Administration also organized experts and scholars from relevant departments to conduct research and asked mobile phone manufacturers to establish relevant funds to conduct more in-depth exploration of the matter in the laboratory. At the same time, in order to alleviate the concerns of mobile phone users, some big mobile phone manufacturers have made a decision. From the beginning of this fall, the specific data (SAR) of the radiation intensity of the mobile phone should be indicated on the mobile phone box to indicate the human body. How much energy can be absorbed from the phone itself. This data size depends mainly on the placement and design of the handset antenna. Professor Molde said: "Those mobile phone users who still have concerns can take some precautions, such as using mobile phone headsets to deliver words." The US Food and Drug Administration also recommended that for safety reasons, those still use old-fashioned Users of analog phones are better to switch to digital phones.
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